Thanks for sharing the error. Here’s what it means and how to address it. What happened - Prefect Cloud returned 429 Too Many Requests from the logs endpoint because your workspace exceeded an API rate limit (most often due to high log volume or many concurrent runs). - You can see exactly which limit was hit and your current usage at your org’s rate limits page: View rate limit usage. - If you consistently need more throughput, contact help@prefect.io to discuss raising limits. Common causes - Very chatty logging (e.g., DEBUG-level logs or large messages/objects). - Many concurrent flow/task runs all emitting logs at once. - Bursts that send many small log batches in quick succession. Quick mitigations (Prefect 3.x) - Reduce log volume: - Set a higher global log level (e.g.,

INFO

or

WARNING

) and quiet noisy libraries. - Avoid logging large payloads; summarize instead. - Tune log batching to lower request rate: - Increase the batch interval so logs are sent less frequently. - Cap max log size to avoid oversized log records. - Stagger/limit concurrency to smooth bursts. - Allow the client to retry/back off on 429s by increasing max retries. Suggested settings (env vars) - Disable logs to API temporarily (for heavy jobs) while you investigate: -

PREFECT_LOGGING_TO_API_ENABLED=false

- Otherwise, tune batching and size: -

PREFECT_LOGGING_TO_API_BATCH_INTERVAL=5

(seconds; increase from default ~2s) -

PREFECT_LOGGING_TO_API_MAX_LOG_SIZE=200000

(bytes; trims very large messages) - Reduce verbosity: -

PREFECT_LOGGING_LEVEL=INFO

(or

WARNING

) - Increase HTTP client resilience: -

PREFECT_CLIENT_MAX_RETRIES=8

(default is 5) Example

export PREFECT_LOGGING_LEVEL=INFO
export PREFECT_LOGGING_TO_API_ENABLED=true
export PREFECT_LOGGING_TO_API_BATCH_INTERVAL=5
export PREFECT_LOGGING_TO_API_MAX_LOG_SIZE=200000
export PREFECT_CLIENT_MAX_RETRIES=8

If you can share a bit more about your workload (approx concurrent runs, logging level, whether you recently enabled DEBUG or added large logs), I can suggest a tighter set of changes.